but the problem is strange... i have tested it on 3 systems with xbmc, media player and vlc player. on my htpc (acer revo, amd e-450, win 7), the video files have a bit of "flickering" or something else. in bright scenes it is just like the auto-contrast option of an hdtv. the image changes it's brightness in a fraction of a second. i've tested so far:

i have also tried the contrast-options at my hdtv, amd catalyst control center and windows 7 aero. also the vsync option in xbmc. nothing helped. also "auto refresh rate" on/off.
it's not a case of life and death, but it's a little bit annoying. sometimes you look more for the flickering bright scenes than the movie.

i checked everything yesterday. every crappy option. the solution? here it is:

when xbmc is playing a video, the CCC option "automatic contrast" grab for the video playback.but ONLY in xbmc. when i play the video file with windows media player, vlc player or anything else, it doesn't. no idea why. just stupid this tool. from year to year it's getting worse.

I had the same problem. I had ccc not to autostart becuse it would minimize xbmc to the desktop but i found out that when it was running i had no flicker. I have also turned everything off that has anything to do with the picture in ccc and now if i let it run as it should the flicker is gone.... Its really strange. But the flicker is gone so im happy.